Padlock



Oct. 1 4, 1947.

L. w. YOUNG I vPADLocK Filed March 16, 1945 Patented Oct. 14, 1947UNITED STATES PATENT OFFICE :PADLoofKf' Leonard Wear'ei'Young,Northwood, Ilngulamil'- Appucation March 1s, 1945, Sernin@ 5533,046 InGreat Britain 'November 12, 1943 'sctin 1, Public Law 69o, August8,1946.H Patent expires November 12, 1963 the centre line of' Which-ispreferably displaced from the axis of rotation'of' the discganda lockfor locking the disc'in a positionin which the slot in' itsmarginistransversetb the slot inthe edge of the housing.

The'interior' of the housingA may lconver'iiently be cylindrical totthe'cylindrical 'edges of the disc, which thus yrotates within thehousing with# out the necessity of a central pivot pin:

The lock may 'be of any eonve'nie'entl type,- for example the lever't'ype or of the' pin" tumbler type. In the latter caseY thespring-pressed tumblers may behoused n-bores intheedge of the disc andco-operateY with pins sliding in bores in the housing and operated by' akeyl which can be inserted in a key hole in the housing. It ispreferred, however, to provide a separate tumblerlock cylinder mountedinthe bodyY portion of the housing. 'I'his cylinder is provided withl alocking'mernber co-operating with a shoulder on the edge of the disc sothat in one lposition of the cylinder the lockingmember engages the'shoulder to prevent rotation of the disc while in anotherposition towhich the cylinder can be turned by the key the locking member is out ofengagement with the shoulder, with the result vthat the disc can beturned to release the hasp.

The slots inthe housing and-in the disc may be arranged so that the haspwill co-operate with the edges of the slots' to rrotate the disc ineither direction. Alternatively the slots may beso arranged thatalthough the'insertion of the hasp willv turn the'disc into thelocked'position, an attemptto withdraw the hasp will be ineffective' tothe disc intothe unlocked position, the two slots being substantiallyperpendicular to' ori'e4 another. In this case an arcuate slot isprovided inthe cover plate for the insertion of a' screw-threadedpininto a screw-threaded hole inthe di c after the padlock has beenassembled; This 'in the outer Vsurface of thecovplate and i'rovides ameansv whereby the disc'ean be rotated readily. According to a furtherfeature of the invention means are provide'l whereby the lock vrne :l"ii nism `can be assembled with the housingl after thev cover plate hasbeenl secured in position. thecover plate maybe secured to the bodyportion 'of thehousing by a method involving heat, for examplev brazing,welding or the like, without drawing the temper of the springs formingpart of the' lock mechanism.

Referring to the acc'ornpanying drawings; F'ig'ur'e'l is aside elevationin section of one form of padlock inthe open position;-

Figure 2 is a similar View showing the padlock in the'closed position;

Figure `S'is a section along the line III- III in Figure 1 Figure 4 isalsection along the line IV--IV in FgurZ; ,A Figure5`is aview similar'to Figure l of a, modi* ed construction projects beyond ,f

Figure 6 isa similar View ofwanother modification;

kFigure 7 is asection along/the-line VII- VII in Figure Figure 8 is aView similar to Figure 14 of -a further modi'iied con-struction; and

Figure 9' is aside elevation of Figure with the cover plate in position.

Referringv to Figures 1 to'4, a housing Ill' is formed'with acylindrical recess l2 in which rotates aY cylindrical discv I4constituting a shackle. 'Ifhe housing is formed with a slot I6 which isO ITsetslightly to one side as shown; The disc Ul is formed with asimilarY slot I8 which isfalso oisetfthat is to say its centre-lineisdis placed froma diameter of the disc. When theentrances to the twoslots arezin register as shown in Figure 1 one side of the slot I8 ispresented at an angle to the slot I5.' When the haspl `2l) to which thepadlock is to be secured is'inserted it willY co-'operate with'theinclined surface tocam thejdisc i4 round toY the closed position shownin Figure 2. The opposite edge of theslot I8 is then presented at anangle such that when theghasp lis pulledoutwards along the slot i6 the.disc is' returned tothe open position, releasing the halspz` k f'hedisc l-is'iormed with a notch 22V which extends across the wholewidth of the disc and this notch communicates with a recess 24 the depthof which is one half of the width of the disc. The notch 22 receives theinner end 26 of a cylinder 28 similar to the cylinder of an ordinary pintumbler lock, carrying pins sliding in transverse bores and co-operatingwith springpressed tumblers 3D sliding in bores in the housing Ill.Normally these tumblers lock the cylinder in the position shown inFigure 2 but the insertion of a correct key frees the cylinder andenables it to be rotated. The end 26 of the cylinder is cut away asclearly shown in Figures 3 and 4 to semi-cylindrical shape. In theposition shown in Figures 2 and 4 this part 26 is in engagement with theright hand side of the notch 22 thereby preventing the disc I4 fromrotating in the clockwise direction, while rotation in the anticlockwisedirection is of course prevented by engagement of the part 26 with thelefthand side of the notch. When the cylinder 28 is rotated by the keyinto the position shown in Figures 1 and 3, the part 26 is in registerwiththe recess 24 and no longer in engagement with the right hand sideof the notch 22. Thus the disc I4 can turn as previously described intothe position shown in Figure l to release the hasp 26.

The bore in the housing I6 for the cylinder 2B is counterbored as at 32to receive the end of an outwardly spring-pressed pin 34 mounted toslide radially in a bore in the cylinder. When the cylinder is firstinserted in the housing this pin 34 is pressed inwards but when thecylinder is completely inserted the pins spring7 outwards into thecounterbore 32. thereafter preventing the withdrawal of the cylinder.Stops (not shown) may be provided in the counterbore for engagement withtbe pin 34 tclimit the rotation of the cylinder to 180,

It is evident that the cylinder 28 and the tumblers 3i! and theirsprings can be inserted after the cover plate 36 (Figures 3 and 4) hasbeen secured to the housing I8. It is therefore possible to secure thecover plate to the housing by brazing, spot welding or a like operationinvolving heating, which would be impossible if the tumblers and theirsprings had to be assembled with the padlock before the cover plate issecured in place.

Preferably the disc I4 is formed with a projection 38 engaging in anarcuate recess 40 in the cylindrical side of the recess I2. This ensuresthat the disc I4 is ina position, after the cover plate has beensecured, in which either the notch 22 or the recess 24 will receive theend 26 of the cylinder. A

Y It will be appreciatedthat when the cylinder is in the position shownin Figure 1 the key cannot be withdrawn and the disc I 4 cannot belocked in the open position. In the modified construction shown inFigure a second notch 23, similar tothe notch 22, is provided which,when the disc 1s in the open position, is in register with the part 26of the cylinder, enabling the cylinder to be turned back to the lockedposition in which the key can be withdrawn, the disc I4 then beinglocked in the open position. If thepadlockhas the dimensions andproportions shown, the part 26 of the cylinder 28 must be of smallerdiameter than the rest o f the cylinder so that the two notches 22, 23vdo not break into one another.

Referring now to Figures 6 and '7the housing I0 and the disc I4 aregenerally similar to those shown in Figures 1 and 2. The cylinder 28,however, is arranged at right anglesto the Vposition that it occupies inFigures 1 and 2. Its

end 21 is squared to i-lt a square hole in a locking member 42co-operating with a notch 44 in the periphery of the disc I4. As clearlyshown in Figure 7, when the cylinder 28 is locked against rotation thelocking member 42 is in engagement with the side of the notch 44 therebylocking the disc I4 in the closed position. When a correct key isinserted the cylinder can be rotated to move the locking member sidewaysout of enga/gement with the notch 44 thereby enabling the disc I4 torotate into the open position to release the hasp.

Referring to Figures 8 and 9, the locking mechanism is of thecombination type, consisting of a number oi discs 46 formed with ilats48 in various angular positions relative to central slots 56 in thedisc. These discs are threaded on a spindle 52 journalled in the disc I4and having a projection 54 co-operating with the ends of the slots 56.This is a Ywell known form of locking mechanism and need not bedescribed in detail. The spindle 52 carries a knob 56 and a graduateddial 58 co-operating with an index 69 and this knob is turned tosuccessive positions right and left according to the dialling requiredto align all the ats 48 in a position indicated by the dotted line inFigure 8 such that the disc I4 can rotate in the housing ID,

The disc I4 in Figures 8 and 9 differs from that shown in earlierfigures in thatwhen it is ,in the closed position the slot I6 is atright angles to the slot I3. The disc I4 however can be rotated into theopen position merely by pulling the hasp outwardly along the slot I6 asin the constructions described above. Itcan also be rotated by means ofthe knob 56,'9. slot 62 being provided in v the cover-plate ofthe-housingY to receive the for locking spindle 52. This slot is coveredup at all times by the dial 58. When some'other form of lock is used,such as those shown in Figures l, Zand 6, a pin 64 (Figure 6) may bescrewed into a hole in the disc I4, this pin projecting` through'a slot65 in the cover-plate and providing a means whereby the disc I4 may berotated. In some cases this pin may project from the edge of the discthrough a slot in the edge of the housing.

It is evident that the cover plate may be secured to the housing bymeans of rivets or any other well known method, although in most casesbrazing or welding will be preferred on account of their greatersecurity;

What I claim is: v y

1. A padlock comprising a housing provided with a cylindrical bore andan oiset marginal slot for the entry of `a hasp, a cylindrical disc ttedin said bore, said disc having an oiset hasp slot, said disc beingrotatable from a first position where the mouths of said slots are inregistry and the bottoms of the slots are out of registry to a secondposition where the bottoms of the slots are in registry and the mouthsare not, and means said disc in said second position,

2. A padlock according to claim 1 wherein the means for locking .saiddisc in'said second position comprises a locking member mounted in saidhousing, said rotatable disc being provided with a notch that provides ashoulder, vsaid locking member being mounted for movement into and outof engagement with said shoulder, and keyoperated means normally holdingthe locking member in locking position but capable of being disengagedby the operation of a key.

3. A padlock according to claim 1 wherein the means for locking saiddisc in said second position comprises a locking member, a rotatabledisc beingformed with a notch providing a shoulder, said locking memberbeing mounted in said housing to move into and out of engagement withsaid shoulder and being a part of the cylinder of a pin and tumble lockmounted for rotation in a bore in said housing 4. A padlock according toclaim 1 wherein the rotatable disc is formed with a notch providing ashoulder for coaction with the cylinder of a pin and tumbler lockmounted for rotation in a bore in said housing, said cylinder andshoulder constituting the means for locking said disc in said secondposition, said cylinder being semi-cylindrical at the end that coactswith said shoulder and the part of the rotatable disc that provides theshoulder being formed with a recess which is in registry With thesemi-cylindrical end of the cylinder so as to permit rotation of thedisc when the cylinder is out of locking position.

LEONARD WEARE YOUNG.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS 10 Number Name Date 1,490,453 Caldwell Apr. 15,1924 1,922,897 Mahindra Aug. 15, 1933 FOREIGN PATENTS 15 Number CountryDate 264,345 Germany Sept. 23, 1913

